<template>
  <div class="vk-tooltip" ref="popperContainerNode" v-on="outerEvents">
    <div class="vk-tooltip__trigger" ref="triggerNode" v-on="events">
      <slot />
    </div>
    <Transition :name="transition">
      <div v-if="isOpen" class="vk-tooltip__popper" ref="popperNode">
        <slot name="content">
          {{ content }}
        </slot>
        <div id="arrow" data-popper-arrow></div>
      </div>
    </Transition>
  </div>
</template>
<script setup lang="ts">
import { ref, watch, reactive, onUnmounted, computed } from 'vue';
import { createPopper } from '@popperjs/core';
import type { Instance } from '@popperjs/core';
import { debounce } from 'lodash-es';
import type { TooltipProps, TooltipEmits, TooltipInstance } from './types';
import useClickOutside from '../../hooks/useClickOutside';
defineOptions({
  name: 'VkTooltip',
});
const props = withDefaults(defineProps<TooltipProps>(), {
  placement: 'bottom',
  trigger: 'hover',
  transition: 'fade',
  openDelay: 0,
  closeDelay: 0,
});
const emits = defineEmits<TooltipEmits>();
const isOpen = ref(false);
const popperNode = ref<HTMLElement>();
const triggerNode = ref<HTMLElement>();
const popperContainerNode = ref<HTMLElement>();
let popperInstance: null | Instance = null;
let events: Record<string, any> = reactive({});
let outerEvents: Record<string, any> = reactive({});
let openTimes = 0;
let closeTimes = 0;
const popperOptions = computed(() => {
  return {
    placement: props.placement,
    modifiers: [
      {
        name: 'offset',
        options: {
          offset: [0, 9],
        },
      },
    ],
    ...props.popperOptions,
  };
});

const open = () => {
  openTimes++;
  console.log('open times', openTimes);
  isOpen.value = true;
  emits('visible-change', true);
};

const close = () => {
  closeTimes++;
  console.log('close times', closeTimes);
  isOpen.value = false;
  emits('visible-change', false);
};

const openDebounce = debounce(open, props.openDelay);
const closeDebounce = debounce(close, props.closeDelay);

const openFinal = () => {
  closeDebounce.cancel();
  openDebounce();
};
const closeFinal = () => {
  openDebounce.cancel();
  closeDebounce();
};

const togglePopper = () => {
  if (isOpen.value) {
    closeFinal();
  } else {
    openFinal();
  }
};
useClickOutside(popperContainerNode, () => {
  if (props.trigger === 'click' && isOpen.value && !props.manual) {
    closeFinal();
  }
  if (isOpen.value) {
    emits('click-outside', true);
  }
});
const attachEvents = () => {
  if (props.trigger === 'hover') {
    events['mouseenter'] = openFinal;
    outerEvents['mouseleave'] = closeFinal;
  } else if (props.trigger === 'click') {
    events['click'] = togglePopper;
  }
};
if (!props.manual) {
  attachEvents();
}
watch(
  () => props.manual,
  (isManual) => {
    if (isManual) {
      events = {};
      outerEvents = {};
    } else {
      attachEvents();
    }
  }
);
watch(
  () => props.trigger,
  (newTrigger, oldTrigger) => {
    if (newTrigger !== oldTrigger) {
      // clear the events
      events = {};
      outerEvents = {};
      attachEvents();
    }
  }
);
watch(
  isOpen,
  (newValue) => {
    if (newValue) {
      if (triggerNode.value && popperNode.value) {
        popperInstance = createPopper(
          triggerNode.value,
          popperNode.value,
          popperOptions.value
        );
      } else {
        popperInstance?.destroy();
      }
    }
  },
  { flush: 'post' }
);

onUnmounted(() => {
  popperInstance?.destroy();
});
defineExpose<TooltipInstance>({
  show: openFinal,
  hide: closeFinal,
});
</script>
